/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.core;



import com.bff.gaia.unified.sdk.transforms.windowing.BoundedWindow;

import com.bff.gaia.unified.sdk.transforms.windowing.WindowFn;

import com.bff.gaia.unified.vendor.guava.com.google.common.annotations.VisibleForTesting;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.ImmutableSet;



import java.util.Collection;

import java.util.Set;



/**

 * Implementation of {@link ActiveWindowSet} used with {@link WindowFn WindowFns} that don't support

 * merging.

 *

 * @param <W> the types of windows being managed

 */

public class NonMergingActiveWindowSet<W extends BoundedWindow> implements ActiveWindowSet<W> {

  @Override

  public void cleanupTemporaryWindows() {}



  @Override

  public void persist() {}



  @Override

  public Set<W> getActiveAndNewWindows() {

    // Only supported when merging.

    throw new UnsupportedOperationException();

  }



  @Override

  public boolean isActive(W window) {

    // Windows should never disappear, since we don't support merging.

    return true;

  }



  @Override

  public boolean isActiveOrNew(W window) {

    return true;

  }



  @Override

  public void ensureWindowExists(W window) {}



  @Override

  public void ensureWindowIsActive(W window) {}



  @Override

  @VisibleForTesting

  public void addActiveForTesting(W window) {}



  @Override

  public void remove(W window) {}



  @Override

  public void merge(MergeCallback<W> mergeCallback) throws Exception {}



  @Override

  public void merged(W window) {}



  @Override

  public Set<W> readStateAddresses(W window) {

    return ImmutableSet.of(window);

  }



  @Override

  public W writeStateAddress(W window) {

    return window;

  }



  @Override

  public W mergedWriteStateAddress(Collection<W> toBeMerged, W mergeResult) {

    return mergeResult;

  }

}